Abrading devices



Oct- 1, 1 6 R. SGORBATI, SR

ABRADING DEVICES Filed Jan. 30, 1962 INVENTOR, RICHARD SGORBATI, SR.

BY M

AT TORNE Y United States Patent 3,105,329 AEBXRADING DEVICES Richard Egorhafi, Sin, 8117 Pine Road, lhiladelphia 11, Pa. Filed Jan. 30, 1962, Ser. No. 169,783 1 Claim. (Cl. 51-186) The object of the invention is to provide improvements in what will be termed surface abrading devices, and especially with relation to those which are intended and can be used to at least roughly smooth surfaces of masonry, such for example and merely to illustrate the type of work involved, as the smoothing of walls, floors, ceilings and the like for further coating with finishing materials, after they have been assembled and laid in place by the relatively rough work and treatment, that usually characterizes the laying of plane and substantially plane surfaces of the initial erections usually made in relatively great haste and speed by workmen of the less well-trained types.

In buildings that involve such type of craftsmanship, whether the laying is of relatively rough bricks, faced stoneware, or building blocks formed of cement and the like, the basic materials are not characterized by any great degree of smoothness, nor is the mortar or cement employed laid flush and exactly in the same plane with the brick or similar surfaces, or instead it may be and in fact usually is quickly smoothed off with a concave surface, such as that afforded by the free nose angle of an ordinary masons trowel or the like.

Another and more specific object is to provide a device for this purpose, that essentially comprises a preferably long handle for reaching high locations and those which are not otherwise readily accessible, a demountable rigid disk or plate having the desired degree or type of abrasive surface, and a coupling of special shape for attaching such plate to said handle, comprising a yoke whose central portion is parallel with the plane of said plate when attached thereto, and a pair of oppositely spaced depending angularly related side flanges whose freely extending terminals are diverted angularly outwardly and in direct engagement with said disk or plate, so that their respective relatively sharp edges frietionally engage said disk or plate, and serve to positively prevent the same from turning with respect to the supporting coupling and handle.

In considering this device and the following description of its preferred embodiment, it is to be understood that there is no limitation intended with relation to the handle, that instead of the disk shown any one of probably an infinite number of abrasive plates may be employed, the coupling used may be any one that can be pivotally connected to the handle and is preferably formed inexpensively from a blank of sheet metal, comprising a pair of spaced edged extensions that directly engage said plate with an appreciable degree of lateral resiliency, and together form a rigid and unyielding support for the plate.

With the objects thus briefly stated, the invention comprises further details of construction and operation, which are hereinafter fully brought out in the following description, when read in conjunction with the accompanying drawings, in which PEG. 1 is a top plan view of an abrading device comprising one embodiment of the invention operatively associated with a surface formed of cement or similar blocks and intervening strips of cement or the like; FIG. 2 is an enlarged side elevation of the abrading device and a portion of the handle; FIG. 3 is a front elevation of the same; and FIG. 4 is a fra mentary section on the line 4--4 of FIG. 3.

Referring to the drawings, a handle 1 may be of any suitable material, but [in view of the relatively rough work in which the device is normally used, and the desire to minimize the vibrations in which the device is usually involved, a section of any desired length of metallic tubing 13,15,329 Patented Oct. 1, 1963 is employed, as for example the desired length of ordinary pipe or the like, and this if desired may be provided with a wooden or similar outer terminal 2, while the opposite end is secured between a pair of metallic straps 3, by means of bolts 4 or the like.

These straps preferably diverge at 5 fora short distance below the end of the handle, and then proceed in parallel relation 6, being separated by a tubular spacer 7 through which extends a long bolt 8, while the lower free ends 9 of said straps are pivotally secured by a specially shaped bolt '10, or the like, to the parallel spaced sides 11 of :1 preferably slightly yielding inverted U-shaped coupling elemnt 12. Said sides it will be noted diverge below the limits of the ends of said handle straps, to form angularly related terminals E13 that are in effect resiliently positioned, and have the edges 14 of their angular ends in direct frictional engagement with the upper surface of a relatively rigid disk or plate 15, upon the normally exposed under surface of which are secured granules of abrasive material, such for example as the grains of emory that characterize so-called emory-board. Let it be noted that engagement of the divergent terminals of said coupling and the surface of said emory-board is primarily through the angular edges or lines of said divergent terminals, so that while being used within a Wide range of ordinarily very rough handling a very firm and unyielding association may be obtained and maintained, so that to all intents and purposes a practically fixed and unyielding engagement exists, and any movement of the handle results in a definite corresponding movement of the abrasive elements.

Said abrasive disk or plate may be secured in place with respect to said coupling in any suitable manner, as for example by the use of an attaching bolt 16, that passes through an axially central hole "17 in said disk or plate and the upper central portion of the coupling element 12. As the central position of this last-mentioned bolt 16 is definitely desirable, and similarly also the central position of the bolt '10 through the parallel sides of said coupling element, such a condition results in the necessity of making the latter curved at its center (as shown in FIG. 4) to get around the former. In this manner the various details of the device may be free from mutual conflict, while providing a permanently symmetrical assembly.

When in use a man, standing upon a scaffold or an ordinary hanging horizontal board or the like, has to reach far to each side of his body and both far upwardly and downwardly, so that it is only by providing and maintaining a relatively free association of the several par-ts of the device, such as the handle, the abrasive disk or plate, (and the handle or supporting bar, that a fully equal and evenly divided pressure may be maintained by the operator and between said abrasive disk or plate any given surface within his reach.

As to cost of production and operation, it may be asserted with the confidence that results from extensive use under widely different conditions and involving widely different materials, that the construction here described and the uses roughly referred to indicate something of the extremely economical results assured, as for example the fact that adjustment and replacement of each and every part may be made and maintained with a real minirnum of effort and outlay, and when a given disk or plate has been used and become too smooth for further proper functioning, it may be replaced merely by loosening the central axial nut and bolt, removing the worn disk or plate, replacing it with a fresh one, and replacing and adjusting the bolt and nut to the degree of tightness desired.

Having thus described my invention, what I claim and desire to protect by Letters Patent is:

A surface abrading device for use in masonry, comprising a handle, a relatively rigid abrasive disc, a coupling that comprises a metallic member whose intermediate lateral portions are substantially parallel, and support angularly divergent flexible terminal portions whose edges only yieldingly engage said disc, means to pivotally attach said handle to the parallel portions of said coupling, and means extending through the axial center of said disc to adjustably secure said coupling to the axial center of said disc under varying tension, as said terminal portions flex References Cited in the file of this patent UNITED STATES PATENTS Hansen Oct. 10, 1899 Vosbikian et a1 July 7, 1959 

